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Title: Undulator-Based Production of Polarized Photons

"Project Title: Undulator-Based Production of Polarized Photons" DOE Contract Number: FG02-04ER41355 Principal Investigator: Prof. Kirk McDonald Period of Performance: 09/10/2004 thru 08/31/2006 This award was to fund Princeton's activity on SLAC experiment E166, "Undulator-Based Production of Polarized Positrons" which was performed at SLAC during June and September 2005. Princeton U. fabricated a magnetic spectrometer for this experiment, and participated in the commissioning, operation, and analysis of the experiment, for which Prof. McDonald was a co-spokesperson. The experiment demonstrated that an intense positron beam with 80% longitudinal polarization could be generated by conversion of MeVenergy circularly polarized photons in a thin target, which photons were generated by passage of high-energy electrons through a helical undulator. This technique has since been adopted as the baseline for the polarized positron source of the proposed International Linear Collider. Results of the experiment have been published in Physical Review Letters, vol 100, p 210801 (2008) [see attached .pdf file], and a longer paper is in preparation.
Authors:
Publication Date:
OSTI Identifier:
940364
Report Number(s):
DOE/ER/41355-1
TRN: US1000937
DOE Contract Number:
FG02-04ER41355
Resource Type:
Technical Report
Research Org:
The Trustees of Princeton University
Sponsoring Org:
USDOE Office of Energy Research (ER)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; AWARDS; COMMISSIONING; ELECTRONS; LINEAR COLLIDERS; MAGNETIC SPECTROMETERS; PERFORMANCE; PHOTONS; POLARIZATION; POSITRON BEAMS; POSITRON SOURCES; POSITRONS; PRODUCTION; STANFORD LINEAR ACCELERATOR CENTER polarized photons, longitudinal polarization, high-energy electrons